Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Weight | 320 g | 260 g |
| Driver size | 40 mm | 42 mm |
| Active noise cancellation | true | false |
| Multipoint | true | false |
| Battery life | 30 h | 0 h |
Between the Px8 and HD 660S2, the Px8 comes out ahead in active noise cancellation / multipoint, while the HD 660S2 wins on weight / driver size. Overall, the Px8 scores 70.8 and the HD 660S2 scores 52.5 on our Mars Score.
Which should you buy?
The Px8 is the clear pick on raw spec strength, leading by 18.3 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Px8 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are active noise cancellation, multipoint, battery life. The single most decisive one: Has Active noise cancellation.
Pick the HD 660S2 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight, driver size. The single most decisive one: Weight — 60.00 g less. 260 vs 320.
Both ship with comparable spatial audio, ldac, water resistance, so those specs do not separate the two — focus on the differences below.
Bottom line: the Px8 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Bowers & Wilkins - Px8 or Sennheiser - HD 660S2?
Bowers & Wilkins - Px8 leads the current Mars Score by 18.3 points.The more useful decision is the trade-off behind that result: compare driver size, battery life, weight against the way you will actually use the product.
Choose Bowers & Wilkins - Px8 if…
Bowers & Wilkins - Px8 has the measurable edge on has anc, has multipoint, battery life h.
Choose Sennheiser - HD 660S2 if…
Sennheiser - HD 660S2 has the measurable edge on weight g, driver size mm.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Bowers & Wilkins - Px8 wins
- ▲Has Active noise cancellation.
- ▲Has Multipoint.
- ▲Battery life: 30 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 60.00 g less. 260 vs 320.
- ▲Driver size — 5.00% more. 42 mm vs 40 mm.
Spec comparison
Design
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 320 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 40 mm | 42 mmlead |
| Impedanceⓘ | 32 Ω | 300 Ωlead |
| Sensitivityⓘ | 111 dBlead | 104 dB |
| Active noise cancellationⓘ | truelead | false |
| Transparency mode | truelead | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Battery lifeⓘ | 30 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.2lead | 0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, Px8 or HD 660S2?+
Px8 lasts 30 hours vs 0 hours.
Do Px8 or HD 660S2 have active noise cancellation?+
Px8 has active noise cancellation; HD 660S2 does not.
Which supports LDAC, Px8 or HD 660S2?+
Neither supports LDAC.